[PATCH 0/2] Add support for ITE IT885x USB PD controller

[Amber Kao]

This series adds Device Tree bindings and driver support for the ITE IT885x
USB Type-C Power Delivery controller over I2C. The driver uses the auxiliary
bus to spawn UCSI and Alternate Mode child devices from the main I2C core
driver.

Note: This driver has not been tested on physical hardware. Runtime
verification was performed using i2c-stub emulation with force-binding
on an x86_64 virtual machine.

Testing performed:
- checkpatch.pl: no errors or warnings
- dtschema (dt_binding_check): no errors or warnings
- Sparse static analysis (C=2 W=1): no errors or warnings
- checkstack.pl: no functions exceed 512-byte stack limit on x86_64 and arm64
- Dependency check (allnoconfig + make): all dependency is been added
- Kconfig tristate: tested =m, =y, =n and allmodconfig
- Cross-compilation: x86_64, arm64, arm32, powerpc64
- CONFIG_SMP and CONFIG_PREEMPT: both on and off
- Strict warning mode (W=1 EXTRA_CFLAGS=-W): no new warnings
- Fault injection (CONFIG_FAILSLAB): error paths verified on modified kernel

Question regarding Fault Injection testing:
Since physical hardware is currently unavailable for testing, my approach to
verifying the error handling paths was to temporarily modify the driver code
(e.g., forcing a function to return -ENOMEM), run the mock tests, and then
revert the code once passed. Is this ad-hoc instrumentation approach
acceptable for submission under these constraints, or is there an officially
recommended fault injection method that the community prefers for this kind of validation?

Signed-off-by: Amber Kao <amber.kao@xxxxxxxxxx>
---
Amber Kao (2):
      dt-bindings: usb: Add ITE IT885x support
      usb: typec: ucsi: Add ITE IT885x Type-C PD controller driver

 .../devicetree/bindings/usb/ite,itepd-it885x.yaml  | 109 ++++
 MAINTAINERS                                        |  15 +
 drivers/usb/typec/ucsi/Kconfig                     |  15 +
 drivers/usb/typec/ucsi/Makefile                    |   1 +
 drivers/usb/typec/ucsi/itepd.c                     | 481 ++++++++++++++++++
 drivers/usb/typec/ucsi/itepd.h                     |  64 +++
 drivers/usb/typec/ucsi/itepd_altmode.c             | 438 ++++++++++++++++
 drivers/usb/typec/ucsi/ucsi_itepd.c                | 558 +++++++++++++++++++++
 8 files changed, 1681 insertions(+)
---
base-commit: 8fde5d1d47f69db6082dfa34500c27f8485389a5
change-id: 20260605-ucsi-itepd-feature-95e6dcee4fc5

Best regards,
--  
Amber Kao <amber.kao@xxxxxxxxxx>